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shift1 working (on breadboard)

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flo
2012-01-30 17:46:01 +01:00
parent d081051c13
commit 712290e000
1 changed files with 22 additions and 18 deletions
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FastIO.cpp
+22 -18
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@@ -96,52 +96,56 @@ void fio_shiftOut(fio_register dataRegister, uint8_t dataBit, fio_register clock
fio_digitalWrite_SWITCH(clockRegister,clockBit);
}
}
void fio_shiftOut1_init(uint8_t pin){
fio_shiftOut1_init(fio_pinToOutputRegister(pin,HIGH),fio_pinToBit(pin));
}
void fio_shiftOut1_init(fio_register shift1Register, fio_bit shift1Bit){
// Make sure that capacitors are charged
// 300us is an educated guess...
fio_digitalWrite(shift1Register,shift1Bit,HIGH);
delayMicroseconds(300);
}
void fio_shiftOut1_init(uint8_t pin){
fio_shiftOut1_init(fio_pinToOutputRegister(pin,HIGH),fio_pinToBit(pin));
}
void fio_shiftOut1(fio_register shift1Register, fio_bit shift1Bit, uint8_t value){
/*
* this function are based on Shif1 protocol developed by Roman Black (http://www.romanblack.com/shift1.htm)
*
* test sketch: http://pastebin.com/raw.php?i=2hnC9v2Z
* tested with: TPIC6595N
*/
// disable interrupts since timing is going to be critical
uint8_t oldSREG;
oldSREG = SREG;
cli();
//unsigned int msLOW, msHIGH;
// note: profiling showed that shift out takes 18us longer than the sum of needed delays
// iterate but ignore last byte (must be LOW)
for(int8_t i = 7; i>0; --i){
// assume that pin is HIGH (smokin' pot all day... :)
if(LOW==!!(value & (1 << i))){
// LOW = 0 Bit
fio_digitalWrite_LOW(shift1Register,shift1Bit);
fio_digitalWrite_SWITCH(shift1Register,shift1Bit);
// hold pin LOW for 15us
delayMicroseconds(14);
fio_digitalWrite_HIGH(shift1Register,shift1Bit);
delayMicroseconds(15);
fio_digitalWrite_SWITCH(shift1Register,shift1Bit);
// hold pin HIGH for 30us
delayMicroseconds(29);
delayMicroseconds(30);
}else{
// HIGH = 1 Bit
fio_digitalWrite_LOW(shift1Register,shift1Bit);
//hold pin LOW for 1us - did that already
fio_digitalWrite_HIGH(shift1Register,shift1Bit);
fio_digitalWrite_SWITCH(shift1Register,shift1Bit);
//hold pin LOW for 1us - done! :)
fio_digitalWrite_SWITCH(shift1Register,shift1Bit);
//hold pin HIGH for 15us
delayMicroseconds(14);
delayMicroseconds(15);
}
}
// send last bit (=LOW) and Latch command
fio_digitalWrite_LOW(shift1Register,shift1Bit);
delayMicroseconds(199); // Hold pin low for 200us
// Hold pin low for 200us
delayMicroseconds(200);
fio_digitalWrite_HIGH(shift1Register,shift1Bit);
delayMicroseconds(299); // Hold pin high for 300us
// Hold pin high for 300us and leave it that way
delayMicroseconds(300);
// enable interrupts
SREG = oldSREG;